My site was with primary keyword coupon codes, having 15,000 of pages indexing by Google. But when i was generated my site-map i had 13,000 of pages only.. what about rest of 2,000 pages?
That generally means that you have more than one URL pointing to the same page, e.g., yoursite. com/ page1.php and yoursite. com/page1.php?print. Alternatively, if it's a blog, or a directory, or a forum, Google may be indexing the category names.